Die-casting machine



Aug. 2,1927. 1,637,566

J; S. GULLBORG DIE CASTING MACHINE Filed Aug. 1, 1924 a Sheets-Sheet 1.

115%? 5. Gailwy g J. s. GULLBORG DIE CASTING MACHINE Filed Aug. 1. 1924 8 Sheets-Sheet 2 Jr? 19 6 r1 60/ John 5 (rzzllborg Aug. 2, 1927.

J. s. GULL BORG DIE CASTING MACHINE 8 Sheets- Sheet 3 Q/wverzfif @6275. 611116079 DIE CASTING MACHINE Filed Aug. 1, 1924 8 Sheets-Sheet 1,637 566 1927 J. 5.,GULLBORG DIE CASTING MACHINE Filed Aug- 1, 1924 8 Sheets-Sheet 5 LA J . 071/7 .5, Gullorg 1,637,566 2, 1927' J. s. GULLBORG DIE CASTING MACHINE Filed Aug. 1, 1924 s Sheets-Sheet 6 7 1,637,566 2, 1927- J. 5. GULLBQRG DIE CASTING MACHINE Filed Aug. 1, 1924 8 Sheets-Sheet 7 d d nvavzfw J. S. GULLBORG DIE CASTING MACHINE Aug. 2, 1927.

a Sh eets-Sheet 8 Filed Aug. 1, 1924 Patented Aug. 2, 1927'.

UNITED STATES PATENT OFFICE-.1

JOHN s. someone, or cmcaeo; mnmora'nss'renon T annmrr. nm-cas'rme a mm. 00., or cnrcaeo, rumors, A coarona'rron or rumors.

nm-casrmc MACHINE.

Application filed August 1, 1924. Serial No. 729,450.

The present invention relates to die-casting machines. 1

One of the prominent ob ects ofthe invention is to provide improved means fortransferring the molten metal from the melting pot to the diemold. This improved I means comprises a nozzle, the spout of which sprue 'hole entering the underside 0f the die -mold. Consequently, the entire motion of the nozzle is a simple upwardand downward oscillation, by which a high rate of operation of the machine is maintained. The nozzle holds onlya small weight of metal compared to the weight of metal in the pot, and consequently by moving the nozzle instead of the pot there issaved a considerable expenditure of power. Moreover, by mov-,

ing the nozzle, the movement may berelativelv rapid without the possibility of any s'urgingor agitation of the which might result from a rapid movement of the pot; also, by the practice of a moving the nozzle there is no difficulty in maintaining the melting pot under continuous uniform heat with a fixed arrangement of burner nozzles. 1

A further object of the invention is to pro vide'improved means for pulling the core .pins or othencore members from the die '1} molds. According to the present invention Iutilize compressed air 01 obtaining the re uisite' power for pulling the core pins,

.an il associate with this compressed air .mechanism mechanical restraining means for controlling and moderating the action of the compressed air mechanism. This re-j straining means prevents the compressed air mechanism from jerking out ,the. core pins with a shock, or from completingthe end of core pins let go. By: using compressed air .for the core pulling energy instead of mechanical means, such as cam mechanism in'the machine, a large amount of energy can be q'uickl concentrated on the core pins without shoe: or vibration in the machine and without undesirable stresses in the wor ing parts of' the machine.

Other objects concerned with the features molten metal the pulling stroke with ashockwhen the of construction of the machine will be apparent from the following detailed description of a preferred embodiment of my invention, this preferred embodiment being illlustlrated in the accompanying-drawing in 1' 11C '11-- machine; 6

Fig. 2 is a longitudinal sectional view of the machine;

. Fig. 2 is a fragmentary detail section of a part of Fig. 2;

' Figi3 is a top plan view of the same;

Fig. at is a bottom plan view of the table viewed from the under side;

Fig. 1 is a side elevational view ofxthe Fig. 5 is an elevational view of the end of the machine containing the metal pot and metal conveying nozzle; and

Fig. 6 is a similar view of the opposite end of the machine;

Fig. 7 is a vertical transverse sectional view taken on the plane of the line 7 --7 of Fig.2;

Fig. 8 is a similar view taken on the plane of the line 8-8 of Fig. 2; and

Figs. 9 and 10 are plan and vertical sectional views, respectively, of the pneumatic core pulling cylinder.

The table of the machine is designated 9 and it will be observed from Fig. 7 that this table has an outer depending flange 9, to which are bolted several of the frame members and appurtenances of the machine.

The table is dividedthrough its len th into front and rear halves having metial flanges 10 which are bolted together on the under side of the table (see Fig. 4;). Corner legs 11 are secured-to the table 9 by bolts 12, (see Fig. 4 and intermediate legs 13 of T section are also secured to the table 9 by bolts 12. Side plates 14 (Fig. 1) are bolted to the left-hand corner legs and to the two chine. A pit 15 is formed in the floor or vother foundation for accommodating some of "the operating wheels and other parts of the machine. I

Formed on the up er surface of the table 9 are two beveled gui cs 19, on which moves a reciprocating slide 21 having correspondingly beveled" guide members 16 (Fig. 7 An uprig t supporting face 22 is formed a jalcent the forward end ofthe slide 21, and to this face is -b'olted one section 23 0f the die mold (see Fig. 1). The other section 24 of the die mold is fixedly supported on the described is duplicated front face of a standard rising from the table of the machine. This standard has lateral flanges which are bolted to the table of the machine, as indicated at 26, and on its front die supporting face has a lower flange 27 against which the lower edge of the die section rests, the upper end of the die section being securely clamped against the standard. Rising from the other end of the table are a pair of spaced standards 29, which are likewise bolted to the. top of the table, as indicated at 31. As shown best in Fig. 6, each standard 29 is formed with a boss 32, on the opposite sides of which a pair of links 3333 are pivoted upon a transverse pivot pin 35. These two links 33 form one arm or link of a toggle link connection between the standard 29 and the reciprocating slide 21. The knuckle of the said toggle is formed by a transverse pivot pin 35 which passes through the upper ends of both links 33, and through a pair of links 36 disposed just inside of the links 33, and also through a central power link 37 which has its eye 'disposed between the links 36. The lower ends of the links 36 carrv a block 38 which receives the threaded shank of an eye-bolt 39. A nut 41- Fig. 2) screws over the u per end of the eye olt 39, whereby the eyeolt can be adjusted up or down relative to the links 36 and locked in position. The eyebolt 39 extendsinto a clevis opening in a metallic horn orarch 42, being pivotally secured in this clevis opening by a transverse pivot pin 43. The horn or arch 42 is a curved reinforcing member formed inte ral with the horizontal portion of the sli e 21 and the upright 'die supporting face 22. This arched member reinforces the die face 22 against the pressures transmitted to the die face, and also affords a convenient point of connection between the toggle mechanism and the slide. The tog le mechanism just fbr the other standard 29, as shown in plan in Figure 3. That is to say, the other standard has a similar pair of links 33 connecting with another pair of links 36 and with a downwardly extendmg power link 37. The links 36 of this latter toggle mechanism have pivotal connection through an eye-bolt 39 with a second curved reinforcing arch 42.

I Referring to Figs. 3 and 4, both power links 37 converge together and pass down through a slot 44 in the table9, for pivotal connection at 45 on opposite sides of a sin le central rocking lever 46. This lever is pivoted at its inner end on a pivot pin 47 extending through spaced bearing hubs carried on a bearing bracket 48.- A main operating shaft 49 extends transversely through the machine below the lever 46 andhas its ends journaled in four-arm bearing brackets 51 which are bolted to the legs1113, and to the flange 9' and floor 20, Mounted fast on this shaft is a. wheel 52 disposed in close proximity to the lever 46. The face of the wheel adjacent the lever 46 is formed with a cam groove 53 of the configuration shown in Fig. 2. A roller bracket 54 is secured to the side of the lever 46 and this bracket carries a roller 55 which lies in the cam groove 53. The movement of the roller 55 towards and away from the center of the cam wheel 52 rocks the lever 46 and operates the toggle mechanism 33-36-37 to reciprocate 'the slide 21 towards and away from the stationary die mold 24.

ower is transmitted to the cam wheel through a silent chain 56 this chain meshing with sprocket teeth 57 on the periphery of the cam wheel and being trained up over a relatively small sprocket wheel 58 on a transverse driving shaft 59. As shown in Fig. 4, the shaft 59 is supported at one end in a bearing bracket 61 bolted to the under side of the table, and at the other end is supported in a suitable bearing '62, and has a pulley or driving wheel 63 on its outer end. The means .for effecting and controlling the transmission of power to the pulley 63 may be of the same general description as-that disclosed in my prior Patent No. 1,322,502. As representative of the manual actuating element for this control mechanism, I have shown an operating lever 7 O pivoted to the front of the machine (Fig. 1), and connected through a rod 80 with a lever supported on a control shaft extending back into the machine. A full and complete description of this control mechanism, is contained in this prior patent, and accordingly I shall not go into. the details of such control mechanism in the present'application.

I shall now describe the operating mechanism for those movable supporting members that carry the upper and lateral core pins, core boxes, or other upper and lateral die members. The opposite'side of the cam wheel 52 is provided with another cam groove 64 formed between laterally projecting flanges on the face of the wheel similarly to the cam drum 53, but differing therefrom in that thiscam drum 64 is of some-- what elliptical form. Tracking in this cam groove is a roller 65 which is pivotally supported on one endof a rocking lever 66.

lUO

This lever 66 is pivoted at its intermediate point on a pivot 67 carried on a bracket 68 depending from the under side of the table 9. The outer end of the lever projects beyond the end of the machine for pivotal connection at 69 with a pair oflinks 71 which extend up and have pivotal connection 7 72 with a vertically reciprocating slide 73. As shown in Figure 6, this slide is guided in a suitable guide block, or between a pair of suitable guide members indicated general- 1y at 74. This guiding means 74 is bolted at 75 to the rear standard 29. The upper end of the slide 73 is bifurcated to have pivotal connection at 76 with a horlzont-al rocker arm 77. The left-hand end of this rocking lever 77 is pivoted at 78 to ashort link 79 pivotal-1y connected at 81 to the lefthand'pedestal 29 of the frame; this link 79 permitting a slight lateral motion of the pivot 78 under the rectilinear throw of the pivot 76. The other end of the rocking lever 77 has pivotal connection at 82 with a pair of y links 83 connecting at 84 with a crank arm 85 keyed to. the operating shaft- 86. A cross outside of the bearing bracket 88. The shaft Ill) : 97 bythe bolt 101.

86 extends across the top of the 'machine and has bearing support adjacent its other end in a bearing extension 89 rejecting upwardly from the standard 25 Fig. 5). 7 Outside of the bearing extension 89 a lever 91 is rigidly keyed to the shaft 86, and has pivotal connection at one end through the parallel links 92 with a vertically moving slide 93. This slide is confined in avertical uideway of the standard 25 by guide mem- Eers 94 which are bolted at 95 to the standard .25. Where it is desiredv to use a vertically moving core pin, or an upper-die member in conjunction with the die molds '23 and 24, this core pin or die member is preferably mounted to move directly with the vertical reciprocatory motion of the slide 93. As shown in Figures 2 and 5, an "adjustable plate 96 is supported between the slide 93 and the adjacent wall of'thevertical st-and-' ards 25, this plate having :m'arm 96' extending laterally through a slot in the central upper part of the standard 25. A link 97 is pivotally connected to the upper side of the arm 96 by a bolt 98. An extensible arm 99 is secured to the outer end of this link flanged head on its lower end engaging in a slot or T-shapedrecess 101 in the arm 99, whereby the arm can be slid backward or forward or rotated and thereafterclamped in the desired position relative to the links 97. This arm 99 is adapted-to carry the upper core pin or other upper die arts adapted to cooperate with the .die mol s 23 and 24." Vertical adjustment of the core. in or other die part isconveniently eflectedjjg y securing a threadedhub103 to the 'face of the ad- I justable plate 96 and screwing adjusting screws 104 through bridge members 105 on 93. After eac the slide 93,-these screws 104'being adapted by their manipulation, to shift the block' or hub 103 and late -relative to the slide ma be locked in the bridge members by 100 nuts 107. v

Laterally moving core pins or die parts plunger.

The bolt 101 has a.

boxes bolted to the standard 25. The upper sides of the guide boxes 110 are slotted for receiving the lower ends of bell crank. levers adapted to simultaneously actuate the two plungers 108108. The lower ends of the levers 120 have cylindrical or spherical ends which engage in correspondingly formed recesses 120 in the upper sides of the, The levers 120 are pivoted on stationary pivot pins 102 secured to the standards 25, and the upper ends of the levers have drilled blocks 100 swiveled there chine, similarly to the mounting of the verticalcore pin. Each link 97 is secured to the outer end of its respective plunger 108 by a bolt 98, and each supporting arm 99' has slidable and rotatable connection with the outer end of its respective link through a pivot bolt 101. The vertical and lateral core pins are rigidly held in the clamping grooves 99 in-the' inner faces of the supportmg arms .99 and 99, having a wide range oftransverse and longitudinal adjustment in this supported relation through the swingand extending of the links 97 and arms It will thus be seen-that the timed recipr0-' cation of the slide 93 is operative to thrust inwardly into the die opening upper and lateral corepins or die parts and to remove these die parts after the air pressure is off of the metal in the 'die mold. The operating connectionslwhich I ha'veyheretofore trace for this slide 93, through the shaft 86; and elements 8'5'83--77-71-66 and 64 to the energy required to withdraw the core pins,

etc., from the mold is derived from pneumatic mechanism which I shall now describe the above mechanical connections governing and controlling the operation of this pneumatic mechanism. adjustment the'screws 105 Referring again to 5, the lever 91 is extended to the other side of the shaft 86 'for pivotal connection with a .clevis 201 which has adjustable connection through the nuts 202 with he upper end of a long piston rod 203. This rod extends down to a pneumatic cylinder 204 supported on one side of the table or frame 9. As shown in Figs. 9 and 10, this rod passes down through a gland packing 205 in the cylinder head 206 and has connection with a piston 207 in the cylinder. The cylinder is suspended from a cross trunnion 208, the ends of which have bearing support in brackets 209 bolted to the side of the table. -This permits a limited pivotal movement of the cylinder and avoids all necessity of accurate alingment, etc.

Compressed air is admitted to the upper ,end of the cylinder through a pipe 211 which extends from a suitable valve box 212, bolted to the inner side of one of the brackets 209. Compressed air is supplied to this valve box through a pipe 213 leading from any suitable source, such as the source of compressed air for expelling the metal from the tilting nozzle, which'I shall presently describe. The valve element, not shown, is connected to a long valve rod 214 extending back towards the main operating shaft'49 (Fig. 4). Here it has pivotal connection with a lever 215. One end of this lever has a pivotal mounting on a suitable fixed pivot and the other end supports a roller 216 (Figs. 4 and 7) which tracks on a cam 217 mounted on the shaft 49. A suitable spring holds this roller against the cam face. In one position the shiftable valve in the valve box 212 admits compressed .air to the top of the piston, and in the other position vents this end of the cylinder to atmosphere.

In the operation of the machine the cam.

groove 64 is so timed relative to the cam groove 53in the cam wheel 52 that the slide 93 is moved downwardly and the vertical and lateral die parts are thrust inwardly into cooperation with the stationary die mold 24 before the cam groove 53 actuates the toggle links 3633 to thrust the moving die mold 23 into cooperative engagement with the stationary mold 24. During the time that the slide 93 and its associated corepins or die parts are being moved to their positions between the die sections under the mechanical actuation of the roller tracking in cam wheel groove 64, the piston 207 is bein v drawn up in its cylinder 204. Thecam'21' is at this time holding the roller 216 and lever 215 with the valve element in the valve box 212 in position to vent the upper end of the cylinder. Consequently, the piston moves through the upward stroke unrestricteclly.

In the operation of withdrawing the core pins or like parts from the die opening, the rotation of the cam 217 will rock the lever 215 and oscillate the compressed air valve in the valve box 212 to admit compressed air to the upper area of the piston. Substantially simultaneously therewith the eccentric groove 64 will begin a downward throw of the lever 66, which, acting through the connections 71-77-83-85 and 86 will tend to raise the slide 93 and withdraw the core pins or like parts. The greater rapidity of action of the piston 207 in the cylinder 204, however, results in this piston imposing its energy onthe slide 93 before the ,mechanical means above mentioned, so that the effort of actually cracking the core pins loose from the die opening is performed by this compressed air cylinder 204. The mechanical connections comprising the cam groove 64 and roller 65 follow the action of the air cylinder and govern the action thereof by preventing the air cylinder from jerking the core pins out with a shock and possibly breaking some of the parts. The air cylinder may perform the entire operation of withdrawing the core pins all the way, or the valve in the valve box 212 may be timed to admit air sufficiently long to cause the piston to free the core pins from the die opening, after which the mechanical means 64 65, etc. may take up the duty'of retracting the core pins to the outer limits of their strokes. I

The castings are adapted to be displaced from the movable die section 23 by knock out pinsthrust forwardl through the die section 23 when the sli e-is drawn backwardly to separate the dies. I shall now describe the mechanism for operating these knock-out pins. A shaft 109 is supported for reciprocation in two spaced hubs 111 formed at opposite ends of a sup orting bracket 112 which is bolted to the slide 21. The forward end of this shaft is arranged to support a plate 113 adapted to carry the knockout pins 114. Any number of knockout pins may be carried by the plate 113, and these pins may have different groupings in accordance with the requirements of the particular die, the arrangement in Figure 2 being merely typical. As shown in this figure, two knock-out pins 114 are carried by the plate 113, being secured thereto by nuts 115. A clam 116 is secured around the shaft 109 interme iate the hubs 111, and this clamp has pivotal connection through a pin 117 with a pair of links 118 engaging on opposite sides of the clamp hub. These two links 118 connect through pivot pin 119 with one arm of a bell crank lever 121. The pivot-pin 43 which extends through the eyebolts 39 of the toggle mechanism also extends through the hub of the bell crank lever 121, the latter being positioned between the two arched reinforcing members 42. The other arm of the bell crank lever consists of a socket 122 having an arm or rod 123 pinned therein. A pivot 124 connects the upper endof this arm with two spaced links 125, which extend up and engage over stud ins 126 projecting rom a block 127. This block is slidably supported on a threaded 'rod 128 supported at its ends in hubs 129 'tions for embracing the under sides of-the brace rods 131, this bar being clamped to these rods by upper cooperating clamp sections 132 which engage over the tops of the shafts and are bolted to the bars 131. Look nuts 133 secure block 127 at any desired point along the threaded rod 128.

In forward reciprocation of the slide 21 the bell crank lever 121 will be oscillated in a clockwise direction, and this motion of the bell crank lever thrusts the shaft 109 rearwardly through the links 118. When the slide is reciprocatedbackwardly to separate the dies this bell crank lever is oscillated in a counterclockwise direction, and consequently the shaft 109 is thrust forwardly towards the die section 23, so that the knockout pins 114 will displace the die casting from the die opening- It will be observed that at the beglnning of this die separating motion. the pivot 119 is relatively close to the horizontal plane of the pivot 43, whereby the initial pulling motion von the links 118 and shaft 109 is at a relatively short, powerful radius arm. Thus, the initial movement of the knock-out is very slow. Thereafter, the pivot 119 revolves up to a 'more effective lever arm, with a result that the motion of the knock-out pins is gradually accelerated. This gradually accelerating motion of the knock-out pins avoids any possibility of the pins breakln the castings in displacin them from the die section 23. Any desire length of stroke or timing of the knock-out pins 114 may be obtained by shifting the pinsrelative to the plate 113, or by shifting the clamp116 on the shaft 109, or shifting the bl0ck 127 along the threaded rod 128. I

T e metal pot from which the molten meta is transferred to the dies is designated 134, and islocated at the left-hand end of the machine (Fig. 2). This ot is contained within the casing 135 which is suspended in an opening 136 (Fig.- 4) in the table 9. The casing 135 and potv 134 are capable of being slid endwise out of the slot-like opening 136. A rod or shaft 130 extends crosswise between the end legs 11 and supports rollers 140 on which the casing can be slid out of the opening 136. The casing 135 is lined with a refractory material 137, this heat re--' fractory material being spaced sufficiently from the walls of the pot 134 to leave acombustion chamber area 138. Any suitable arrangement of burner nozzles 139 discharges into this combustion area for heating the pot 134. The pot 134 is removably suspended inthe casing 135 by the engagement of a flange .141 on the pot over a supporting flange 142 on the inner wall of the casing.

The top of the pot is closed by a cover 143. Convenient access is afforded to the interior of the pot through a hinge door or cover 144.

' The metal is transferred from the not 134 to the dies by a nozzle 145 which is first submerged below the level of the molten metal in the pot 134 for receiving a charge, and is then raised up out of the molten metal into communication with the molds for transferring its charge of metal into the dies under -compressed air. The nozzle is pref- 'erablyof the general form illustrated in Figure 2, having an expanded ladle portion at its'lower end and provided with a conical nozzle tip 146 at its u turned end, for reception in a conical soc et at the bottom of the sprue hole passing up to the die opening. This end of the nozzle is'adapted to. be raised and lowered through an opening 147 in the cover 143. The other end of the nozzle extends up out of the pot through an opening 148 in the cover 143, and is bolted or otherwise secured to the cross member 149 of a yoke 151. A plug 152- tightly closes the upper end of this nozzle, the under side of this plug having an annular flange snugly fitting in an annular recess in the upper end shown in Figure 2. The two arms of the yoke 151 extend back and have ivotal .con motion on a common axis throug pivot pins 154 supported in the upper hub ends of a yoke 155 (see Fig. 5). This yoke 155 has pivotal support at its lower end on a transverse pivot shaft 156-,extending through spaced hubs on the bottom of the yoke and through an adjustable bearing 157. The bearing 157 has a screw threaded shank 150 which extendsthrough the lateral arm of a fixed bracket 160 secured to the frame of the machine. The bearing 157 is vertically adjustable in the bracket 160, being. locked in any adjusted position by lock nuts screwing over the threaded shank 150. A screw 159 passes through a suitable opening in the center of the yoke 155 and receives an adjusting nut 161. As shown in Fig. 2 the inner end of this screw is provide with a ivot lug which is pivoted to a fixed.

159 and a spring 162 confined within this recess bears against the pivot lug 180, thus swinging the yoke 155 -outwardly a ainst the adjusting nut 161. The vertical adjustment of the bearing 157 and the horizontal -piv-- otal adjustment of the yoke 155 afi'ords any combination of adjustments for shiftin the nozzle tip 146 horizontally or vertically to cause it to accurately register with the sprue opening of the dies orto vary the pressure between the nozzle and the sprue opening. The nozzle. 145 is raised and lowered through the operation of a pair of levers 163, each of which is riveted to a plate 164 forming part of a relatively long. tubular.

' hub 165. Both' hubs 165 have bearing sup- -port upon a transverse shaft .166, supported at its ends in the lateral frame bars 14..

Riveted o'r bolted to the pair of levers 163 is a single central leverai'm 168. The other end of this central lever has a pivot 169 on which is mounted a roller 171 tracking inv the cam groove 53 of thecam wheel 52. The

single cam track 53 on the cam wheel thus operates to simultaneously rock the lever 46 downwardly for sliding the die sections together, and to rock the lever arm 168 downward'ly for raising the nozzle 145 up against the dies. The cam grooves 53 and 64 and the arrangements of the levers 46, 66 and 168 is such that the laterally moving and vertically moving-die parts are first presented to the die opening by the movement of the die mounting arms 99 and 99'; the die molds '23 are then brought together and immediately thereafter the nozzle 145 is raised to the sprue opening 145 in the bottom of the com.- pleted die mold. a

The upward'motion of the lever arms 163 is transmitted through a pivot shaft 172 connecting with an individual link 17 3 for each lever arm. As shown in Fi ure 8, the

links which raise the nozzle 145. A heavy" compression spring 176 is confined between the bottom of an upper coupling member-17 7 and a washer 178 on the rod 174. A; nut 179 threads over the lower end of the b0 ltl74= and provides means for shifting the washer and adjusting the pressure of the spring 176. The upper end of each bolt 174 has a loose slidin fit in the upper coupling member 177. K transverse pin 197 passing through each bolt 174 and engaging in a slot 198 limits the upward-motion of the.

coupling member 177 along the bolt. The

I upper end of each coupling member 177 is apertured to fit over a heavy stud" 182 projecting laterally from the yoke 151. By virtue of the telescopic engagement of the bolts 174-in the coupling members 179, the nozzle outlet 146 is forcedagainstthesprue hole J of the dies under the combined pressure of thesprings 176176, so that a close pressure joint is secured between the nozzle and the sprue hole which will be tight against the high air pressure admitted to the nozzle.

tending pipe 189. The axis of the elbow 186-188 andpipe 187 is in the same vertical vplane with the axis of the pivot pins 154,

so that in the upward and downward mo tion ofthe nozzle 145 a sli'ght'rotation may occur in the pipe couplings and thus accom-' modate the up and'down motion of the pipe 153'. The pipe 189 communicates with a valve box 191 sup orted on the side of the machine. Air un or pressure is supplied to this valve box through a pipe 192. The valve element may be of any conventional design, and is actuated by valve stem 193 extending out of the valve casing and having pivotal connection through an arm 194 with a vertical lever 195.

This'lever is pivoted to the frame of the machine on a cross shaft 196 (Fig. 5). Under the table top. of the machine this shaft carries a depending arm 197 which has connection with an operating rod 198 (Fig. 1). This rod has pivotal connection with a lever 199 pivotally connected at its other end to the frame. A roller 200 tracks on a cam 221 on the main operating shaft 49.

In the normal cycle of the machine this cam 221 will open the valve 191 after the dies have been closed and after the nozzle 145 has been pressed up into firm engagement with the. sprue hole of the dies. The blast of compressed air into the other end of the nozzle will force the molten metal from the nozzle into the die opening in a mannerwell *known to those skilled in the art. {nit-a further step in the cycle the cam ,will permit counter movement of the rod 198 and close the valve 191, shutting off the compressed air supply and venting the nozzle to atmosphere so that the nozzle can be drawn down away from the sprue hole.

For protecting the operator against molten metal whichmight be blown through crevices or openings in the dies, I have provided a shield 224 which automatically descends and surrounds the dies prior to the metal being blown into the die opening. I

have also providedmeans whereby the valve 191 is incapable of opening to admit compressed air to the nozzle 145 until the shield is entirely down in its protecting position,

and whereby the raising of the shield compels closingof the valve and venting of the nozzle to atmosphere before the dies are exposed.

This shield comprises front and rear duplicate sections 224 and-224 of sheet metal, having inwardly turned .endsas shown in plan in Fig. 3. Each section has corner guides 225 which slide on guide rods 226 supported on the front and rear sides of the machine. The upper ends of these guide rods are joined by braces 227 and 228. Extending upwardly from the lateral corpairs of vertical ners of each shleld section are rods 229, and ad ustably mounted on these rods are bars I 234 on a standard 235 projecting upwardly top of the shaft from-the'standard 87. Acounterweight 236 on the outer end of each lever balances the weight of the shield.

The shield is automatically raised and lowered in pro er timed se uence in the cycle of the tality of two'cams 237 on the main operat-' ing shaft 49 (see Fig. 7). Cam rollers 238 track on these cams, each of these rollers be.- ing pivotally supported on levers 239. As shown in Fig. 1, these levers curve over the 49, being pivoted to the frame of the machine at their lower ends and supporting the rollers 238 at intermediate points. The ends of the levers have pivotal connection with vertical operating rods 241 which extend up through openings in the table of the machine-and pivotally con-. I

. nect with the levers 233.

Referring to Fig. 1, it will be noted that the lever 195, which operates the air valve 191 for blowing the metal into the die opening, has a'roller 243 pivoted at its upper end. This roller is adapted to track on a, vertical rail 244 secured to the guide lugs 225 at the I side of the front shield section. The upper end of the rail is sloped inwardly as -mdi-" cated at 244 so that the roller 243 will be cammed back onto the outer side of the rail in the ascension of the shield. When the shield is in the position illustrated in Fig. 1

the lever 195 is positively held against surgin movement to the right for opening the 'va ve 191, and" at such time it is impossible for the valve to be opened. eitl1eraceiilentally orintentionally. After the shield has been brought down to its lower protecting position, concurrently with the closing of the dies, the roller 243 rides off the upper end of the rail 244. Subsequent to this, the

thrust imparted to the rod 198 under the actuation of the cam 221 finds the lever 195 free tosw-ing and open the valve.-

In the raising of the shield, if the valve has not already closed the sloped en'd'244 of the rail will cam the roller 243 backwardly and positively close the valve. It will be mamas f named means I m resilient engagement with said die meeha- 7 mac 11118 through t e 1nstrumenhaving an end adapted to be swung one position to another vto "transport metal a relatively -said nozzle has motion,

the position of said relatively fixed pivot I understoodthat this closing of the valve shuts oil the supply of compressed air to thenozzle, and vents such quantity ofvcompressediair as remains therein to the atmosphere.

I 'do not intend to be limited tothe. articular details herein shown and descri .ed.

tion of die mechanism,'a relatively stationary metal pot, a nozzle dip ing in said pot, said nozzle havin upwar ly turned ends, one of said ends liavi connection, an upwardly pointed nozzle spout at the other end of said nozzle, means for moving said nozzle relative to said pot to bring said nozzle spout into communication with the under side ofsa-id die mechanism for transferring the molten metal thereto, and spring means cooperatin with said last for holding said nozzle spout nism. v

2. In a die casting machine,the combina- 1.' In a die casting machine, the combinang a compressed 8.11

tion of die mechanism, relativelystiitionarymetal ot, a nozzle of substantially U-shaped form ippingin said pot, means for adin1tting compressed air into one leg of said nozzle, anupwardly opening nozzle spout at the upper end of the otherleg, power means for moving said nozzle to move said nozzle spout up into communication with the under side ,of said die mechanism, and spring mechanism, a pivot for said nozzle, and -means for ad usting sa d pivot 1n aplurality of planes.

4. In a, die casting machine,

the combination of a'molten metal-container,-

a nozzle from means between said ower mechanism and said nozzle.

from said container to the die mechanism,

.fixed pivotabout which :said

and means for adjusting nozzle has motion,

yand horizontally, and'me'ans. for adjusting the position of said pivot vertically.

6. In a die casting machine, the combination of a, molten metal container, a nozzle ie casting machine, the combinathe die mechanism,

a link between said pivots which said nozzle is adapted to swing, a secadapted to transport metal from said'container to the die mechanism, a first pivot associated with said nozzle, "a second pivot,

means for adjus'ting said pivot in one plane, and means for adjusting said first pivot in another lane. p 7. In a die casting machine, the combination of a molten metal container, a nozzle adapted to transport metal from said container to the die mechanism, a pivot about 7 0nd relatively stationary pivot, a link connecting said pivots, means for adjusting one of said pivots vertically, and means for adjusting the other of said pivots horizontally.

8. In a die casting machine, the combination of a molten metal container, a nozzle adapted to transport metal from said container to the die mechanism, and power means for moving said nozzle, said power means comprising a pair of telescopic members, and a spring cooperating with said members for transmitting'a yieldable pressure to said nozzle when the latter isin communicatlon with the die mechanism.

9. In a die casting machine adapted to.

receive die mechanism, the combination of a molten metal container, a nozzle dipping in sa d 'pot, andmeans for moving said nozzle from said pot into communication with the die mechanism, said means comprising a yieldable connection for yieldably pressing said nozzle in communication with said die mechanism, and means for adjusting the pressureof said yieldable connection.

10. In a die casting machine adapted to receive die mechanism, the combination of a relatively stationary metal ot, a nozzle dipping in said pot, means or moving said nozzle in a substantially curved path from said pot into communication with said die mechanism, and means for adjusting the limit of movement of said nozzle.

11. In a die casting machine, the combination of die mechanism, a relatively stationary' metal .pot, a nozzle dipping in said pot,

power means for moving said nozzle m a substantially curved path fi-om said ot into communication with said die mec anism, and means for adjusting one limit of throw of said nozzle.' 7

- 12. In a die casting machine, the combination of die mechanism, a relatively stationary metal pot, a nozzle dipping in said pot and being of U-s'haped fqrm, means for admitting compressedair to onedeg of said nozzle, an upwardly openingnoz'zle spout at the end of the other flog, an operating lever, means for rocking {said lever, a link connecting said lever with said nozzle, said link comprising two telescopic-sections, and a spring cooperating with said telescopic sections to yieldably hold the nozzle spout for adjusting said relatively stationary pivot, means for adjusting said link, a.

power'operated lever, a link connecting said lever with said nozzle, means for adjustin the length of said last named link, an means for transmitting a yieldable pressure to said nozzle through'said last named link. .14. In a die casting machine, the combination ofv die receiving mechanism, a metal pot, a metal conveying .nozzle dipping in said pot, an operatingv lever, a link connecting said lever with said nozzle, resilient means disposed about said link for ur ing the nozzle into cooperation with sai diemechanism and means for adjusting the length of said link.

15. In a die casting machine, the combination of means for supporting die mechanism comprising a reciprocating slide for moving the die parts together, a molten metal pot, a nozzle for conveying the metal from said pot to the die mechanism, actuating mechanism for said slide comprising a cam follower, means for adjusting said mechanism to vary the stroke of said slide including a screw and an element threaded thereon connected to said latter mechanism, actuating.

mechanism for said nozzle comprising a second cam follower, and'an operating member having a cam groove cooperating with both of said cam followers.

16. In a die casting machine, the combination of die supporting mechanism comprising a reciprocating slide, toggle links for in the lateral face thereof, a cam follower associated with said toggle links for operating the same, said cam follower engaging in said cam groove, and a second cam follower engaging in said cam groove for operating said lever.

Inc

17. In a die casting machine, the combination of die supporting mechanism comprising a reciprocating slide, a metal pot, a nozzle for transferring metal from said pot to the die mechanism, a, second die supporting member, operating mechanism for said slide comprising a camfollower, operating mechanism for said nozzle comprising a cam follower, operating mechanism for said sec: ond die supporting mechanism comprising a cam follower, and driving means comprising cam means cooperating with said three cam followers.

18. In a die casting machine, a molten metal container, a nozzle having one end pivotally mounted and adapted to be submergedin the metal therein, and cam means connected to the pivoted end of said nozzle for moving said nozzle about its pivot through a curved path to the die mechanism.

19. In a die casting machine adapted to receive die mechanism, a molten metal con-' tainer, a nozzle adapted to transport metal from said container to the die mechanism, means for moving said nozzle into cooperation with said die mechanism, a cover movable into cooperation with said mechanism, leverage mechanism for actuating said cover, and a counterweight carried by said leverage mechanism.

20. In a die casting machine, die mechanism, a molten metal container, a nozzle adapted to be submerged below the metal in said container for transporting a charge thereof to said die mechanism, pivotal operating mechanism adapted'to raise said nozzle from the molten metal up against the under side of said die mechanism, a cover for said die mechanism, a lever for moving the cover having one end connected thereto and a counterweight associated with the other end of the lever.

21'. In a die casting machine, die mechanism, a metal pot, a nozzle dipping in said pot, means for moving said nozzle from said pot up into communication with the under side of said die mechanism for transferring the molten metal thereto. a cover for said die mechanism, a lever connected at one end to said cover, a counterweight connected to its other end for insuring the removal of the cover from said die mechanism, and cam means for operating said lever.

22. In a die casting machine, a frame, die mechanism carried b said frame, a molten metal container isposed adjacent said die mechanism, a nozzle for conveying molten metal from said container to said die mechanism, and means including a roller for permitting said container to be slid from its position adjacent the die mechanism.

23. In a, die casting machine, a frame, die mechanism carried by said frame, a molten metal container disposed adjacent said die mechanism, a nozzle for conveying molten metal from said container to said die mechanism, a support for the nozzle connected to'the frame, and means forrpermitting said container to be slid from its position adjacent the die mechanism when the nozzle is disconnected from the frame.

24. In a die casting machine, a frame, die mechanism carried by said frame, a molten metal container disposed adjacent said die mechanism, a nozzle for conveyingmolten metal from said container to said die mech anism, a support for the nozzle connected to the frame, and means for permitting said container to be slid from its position adjacent the die mechanism when the nozzle is disconnected from the frame, said means including a plurality of rollers disposed under said container.

25. In a casting machine. a frame, die mechanism supported by. the frame, a molten metalcontainer positioned adjacent the die mechanism, a nozzle in said container having one end pivotally connected to the frame and the-other end movable into cooperation with said die mechanism. and means for moving said nozzle connected to its pivotally mounted end.

26. In a casting machine. a frame, die mechanism supported by the frame. a molten metal container positioned adjacent the die mechanism, a nozzle in said containerv having one end pivotally connected to the frame and the other end movable into cooperation with said die mechanism, and means for moving said nozzle connected to its pivotally JOHN s; GULLBORG. 

